Grate-bar



(No Model.)

- J.` B. MILLER.

GRATE BAR. 0 0 No.1325,852. `Pentenizel Sept.r 8,l `1.885;v

TO \-s A OO QCDOOO Y j Q o@ vOQO@v ATTORNEYS.

` UNITED STATES PATENT NOEECE.

JsEPH B. MILLER, on wILKEs-BARRE, PENNsYLvANIAQ GRATE-BAR.

SPECIFICATION forming part ef Leners Patent Ne. 325,852, dated september s, 188s.

4Application filed March 2F', ld. (No model.) l

T 0 a/ZZ whom, it may concern.-

Be it known that I, JOSEPH B. MILLER, of Wilkes-Barr, in the county of Luzerne and State of Pennsylvania, have invented a-new and useful Improvement in Grate-Bars, of which the following is a full, clear, and exact description.

Reference is to be had to the accompanying drawings, forming a part ofthis specification,

in which similar letters of reference indicate corresponding parts in all the figures.

Figure l is a plan view, partly in section, of a part of one of my improved grate-bars.` Fig. 2 is a side elevation of the same, partly in section. Fig. 3 is an under side view of apart of a bar-section. Fig. 4 isa cross-section of one of the bars, taken through the line x w, Fig. 2. Fig. 5 is a sectional end elevation of one of the bars, taken through the line y y, Fig. 2.

The object of this invention is to provide gratebars constructed in such a manner that the said grate-bars will not be injured by the Vexpanding and contracting of the said bars when heated and cooled.

The invention relates to a gratebar made with perforated and grooved top plates having narrow spaces between their adjacent ends and cast upon lugs cast upon the supportingribs, whereby air can circulate freely through and around the said top plates. The adjacent ends of the top plates of the grate-bar are provided the one end with a projection and the other end with a corresponding recess.

Upon the adjacent ends of the sections of theV grate-bar are formed hooks to engage with a supporting double cross-bar to keep the said sections in place upon the said cross-bar. v In the lower sides of the beveled outer ends of the end sections are formed recesses to allow air to circulate beneath the said ends, as will be hereinafter fully described, and then claimed.

The upper part of the grate-bar is formed of a number of plates, A, which are cast upon lugs B, cast upon the rib or web C of the said grate-bar.

The plates A are cast with narrow spaces D between. their adjacent end edges and with "a projection, E, upon the end of one plate to correspond with asimilar-shaped recess, F,

'ends of the said sections. Y bars L arecast with solid connecting-bars, as

inthe end ofthe next plate. The plates A have numerous holesG formed through them, and have grooves H formed in their upper surfaces, connecting the upper ends of the -frame, and will thus always have a Iirrn bearing. In the lower sides of the ends I are' formed recesses J, to allow air to circulate beneath the said ends.

- At the adjacent ends of the grate-bar sections the projections E and recesses F are elongated, as shown in Fig. l, and upon the lower sides of the said ends are formed hooks K, to engage with the rounded upper edges of the two parts of the supporting-girders or cross-bars L that support the said adjacent The double crossshown in Figs. land 2.

With this construction air can circulatev freely between the ribs C and plates A,through the perforations of the said plates, and along the grooves in the upper surfaces of the said plates, so that the grate-bars will be kept from warping, twisting, and breaking as they are heated and cooled, and at the same time air will have free access to all parts of the fire,

`and will thus cause a more thorough combustion. This tapering or conical formation of the perforations is old, and -I do not claim it as my invention.

Having thus described my invention, I claim l as new and desire to secure by LettersPatentl. A gratebar made substantially as herein shown and described, with perforated and grooved top plates having narrow spaces between their adjacent ends, and-cast upon lugs cast upon the supporting-ribs, whereby the air can circulate freely through and around the said top plates, as set forth.

2. In'a grate-bar, thetop plates, A, cast IOO the said lugs, the meeting ends of the adjacent 10 1 plates being separated, whereby such plates may expand and contract without warping or damaging the rib7 as and for the purposes specified.

JOSEPH B1 MILLER.

LEONARD ROLL,

Vi t n esses:

HERBERT BRADER. 

